Map of the St. Louis area showing the position and track of the aircraft described in the post.

🇺🇸 N400AP - CESSNA 340 - ZOIE AIR LLC N400AP - 3.9 mi away @ 18300 ft, heading SE at 276 mph. Spotted once before. [11:08:43 AM CST] #A4ACAF #N400AP #C340 #N400AP #autopilot #ADSB #ADSBbot